690278233 has 2 divisors, whose sum is σ = 690278234. Its totient is φ = 690278232.

The previous prime is 690278207. The next prime is 690278249. The reversal of 690278233 is 332872096.

690278233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575424144 + 114854089 = 23988^2 + 10717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690278233 is a prime.

It is not a weakly prime, because it can be changed into another prime (690278263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345139116 + 345139117.

It is an arithmetic number, because the mean of its divisors is an integer number (345139117).

Almost surely, 2^690278233 is an apocalyptic number.

It is an amenable number.

690278233 is a deficient number, since it is larger than the sum of its proper divisors (1).

690278233 is an equidigital number, since it uses as much as digits as its factorization.

690278233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 690278233 is about 26273.1466139859. The cubic root of 690278233 is about 883.7743502630.

The spelling of 690278233 in words is "six hundred ninety million, two hundred seventy-eight thousand, two hundred thirty-three".